| 摘要 |
PROBLEM TO BE SOLVED: To provide a high power factor converter which realizes the control in the power factor of almost 1 without generating a distortion due to a noise from an internal circuit in an input current to a voltage step-up and rectifying circuit. SOLUTION: This converter comprises switch elements X, Y connected in parallel to the diodes DX, DY of a diode bridge to which an AC element is supplied via a current control inductor 2, a voltage step-up and rectifying circuit 1 consisting of a smoothing capacitor Cd, an inductor current detector 11 for measuring an actual AC current value applied to the voltage step-up and rectifying circuit, an output voltage detecting circuit 7 for measuring a constant current from the voltage step-up and rectifying circuit 1, an output voltage detecting circuit 8 for measuring a DC voltage from the voltage step-up and rectifying circuit 1, an input current instruction value determination circuit 10 for obtaining an AC target current value based on the reference sine-wave, an integral circuit 13 for obtaining an error of the target current value and actual AC current value to integrate an error with an integral time Ts and then output this integrated value, and a control circuit C for controlling ON and OFF the switch elements X, Y with the integral value.
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